一条mysql语句贯穿
[7] select
[8] [distinct] 列
[1] from 左表
[3] [left|right|full] join 右表
[2] on 连接条件
[4] where where条件
[5] group by 分组的列
[6] having having过滤条件
[9] order by 排序条件
[10] limit 数字;